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UNIGRAPHICS-NX2
UNIGRAPHICS-NX3
FOR
ENGINEERING DESIGN
By
Parthiban Delli
Ming Leu
UMR
Department of Mechanical and Aerospace Engineering
University of Missouri – Rolla
Rolla, Missouri 65401
This project is funded by the National Science Foundation
Advanced Technological Education Program and
Partners of the Advancement of Collaborative Engineering Education
INDEX
FOREWORD .................................................................................................................... 6
CHAPTER 1 - INTRODUCTION................................................................................... 7
1.1 PRODUCT REALIZATION PROCESS ........................................................................ 7
1.2 BRIEF HISTORY OF CAD/CAM DEVELOPMENT ................................................... 8
1.3 DEFINITION OF CAD/CAM/CAE ............................................................................. 10
1.3.1 Computer Aided Design – CAD............................................................................ 10
1.3.2 Computer Aided Manufacturing – CAM .............................................................. 10
1.3.3 Computer Aided Engineering – CAE.................................................................... 10
1.4 SCOPE OF THIS TUTORIAL ..................................................................................... 11
CHAPTER 2 - GETTING STARTED IN UNIGRAPHICS ....................................... 13
2.1 OPENING UNIGRAPHICS AND FILES .................................................................... 13
2.1.1 Open Unigraphics .................................................................................................. 13
2.1.2 Open a New File .................................................................................................... 14
2.1.3 Open a Part File ..................................................................................................... 15
2.2 PRINTING, SAVING AND CLOSING PART FILES ................................................ 16
2.2.1 Print a Unigraphics Image ..................................................................................... 16
2.2.2 Save Part Files ....................................................................................................... 17
2.2.3 Close Part Files...................................................................................................... 17
2.2.4 Exit an Unigraphics Session .................................................................................. 18
2.2.5 Simultaneously Saving All Parts and Exiting ....................................................... 18
2.3 UNIGRAPHICS-NX3 INTERFACE: ........................................................................... 18
2.3.1 Mouse Functionality .............................................................................................. 19
2.3.2 Unigraphics Gateway ............................................................................................ 21
2.3.3 Geometry Selection ............................................................................................... 24
2.3.4 User Preferences .................................................................................................... 27
2.4 COORDINATE SYSTEMS .......................................................................................... 30
2.4.1 Absolute Coordinate System ................................................................................. 30
2.4.2 Work Coordinate System ...................................................................................... 30
2.4.3 Existing Coordinate Systems................................................................................. 30
2.4.4 Move the WCS ...................................................................................................... 30
2.5 USING LAYERS .......................................................................................................... 31
2.5.1 Layer Control......................................................................................................... 31
2.5.2 Commands in Layers ............................................................................................. 32
2.6 IMPORTANT COMMANDS/DIALOGS .................................................................... 36
2.6.1 Toolbars ................................................................................................................. 36
2.6.2 Transform Functions ............................................................................................. 37
CHAPTER 3 - FORM FEATURES .............................................................................. 39
3.1 OVERVIEW.................................................................................................................. 39
3.2 TYPES OF FEATURES ............................................................................................... 39
3.3 PRIMITIVES ................................................................................................................ 43
3.3.1 Model a Block ....................................................................................................... 43
3.3.2 Model a Shaft ........................................................................................................ 45
3.4 REFERENCE FEATURES........................................................................................... 48
3.4.1 Datum Plane .......................................................................................................... 48
3.4.2 Datum Axis............................................................................................................ 50
3.5 SWEPT FEATURES..................................................................................................... 51
3.5.1 Extruded Body....................................................................................................... 51
3.6 REMOVE FEATURES................................................................................................. 54
3.7 EXERCISE - MODEL A WASHER ............................................................................ 57
CHAPTER 4 – FEATURE OPERATIONS ................................................................. 58
4.1 OVERVIEW.................................................................................................................. 58
4.2 TYPES OF FEATURE OPERATIONS........................................................................ 58
4.3 FEATURE OPERATIONS ON MODELS................................................................... 63
4.3.1 Model a Hexagonal Screw..................................................................................... 63
4.3.2 Model an L-Bar ..................................................................................................... 68
4.3.3 Model a Hexagonal Nut......................................................................................... 75
4.3.4 Model a Rack with Instances................................................................................. 78
4.4 EXERCISE - MODEL A CIRCULAR BASE .............................................................. 83
CHAPTER 5 – DRAFTING........................................................................................... 84
5.1 OVERVIEW.................................................................................................................. 84
5.2 DRAFTING OF MODELS ........................................................................................... 85
5.2.1 Drafting.................................................................................................................. 85
5.2.2 Dimensioning ........................................................................................................ 90
5.2.3 Sectional View....................................................................................................... 95
5.2.4 Drafting and Dimensioning of an Impeller hexagonal bolt................................... 96
5.3 EXERCISE - DRAFTING AND DIMENSIONING OF A CIRCULAR BASE........ 100
CHAPTER 6 – SKETCHING...................................................................................... 101
6.1 OVERVIEW................................................................................................................ 101
6.2 SKETCHING FOR CREATING MODELS............................................................... 102
6.2.1 Model an Arbor press Base ................................................................................. 103
6.2.2 Model an Impeller Lower Casing........................................................................ 115
6.2.3 Model an Impeller ............................................................................................... 123
6.3 EXERCISES................................................................................................................ 127
CHAPTER 7 – FREEFORM FEATURE ................................................................... 130
7.1 OVERVIEW................................................................................................................ 130
7.1.1 Creating Freeform Features from Points ............................................................. 130
7.1.2 Creating Freeform Features from Section Strings............................................... 131
7.1.3 Creating Freeform Features from Faces .............................................................. 133
7.2 FREEFORM FEATURE MODELING ...................................................................... 133
7.2.1 Modeling with points........................................................................................... 133
7.2.2 Modeling with a point cloud................................................................................ 137
7.2.3 Modeling with curves .......................................................................................... 139
7.2.4 Modeling with curves and faces .......................................................................... 142
7.3 EXERCISE - MODEL A MOUSE ............................................................................. 145
Unigraphics-NX3 for Engineering Design
University of Missouri - Rolla
3
CHAPTER 8 – ASSEMBLY MODELING ................................................................ 146
8.1 OVERVIEW................................................................................................................ 146
8.2 TERMINOLOGIES .................................................................................................... 146
8.3 ASSEMBLY MODELS .............................................................................................. 147
8.3.1 Top-Down Modeling ........................................................................................... 147
8.3.2 Bottom-Up Modeling .......................................................................................... 148
8.3.3 Mixing and Matching .......................................................................................... 148
8.4 MATING CONDITIONS ........................................................................................... 148
8.5 IMPELLER ASSEMBLY ........................................................................................... 150
8.6 EXPLODED VIEW OF IMPELLER ASSEMBLY ................................................... 164
8.7 EXERCISE - ARBOR PRESS ASSEMBLY.............................................................. 169
CHAPTER 9- MANUFACTURING ........................................................................... 170
9.1 GETTING STARTED WITH MANUFACTURING MODULE ............................... 170
9.1.1 Creation of Blank ................................................................................................ 170
9.1.2 Setting Machining Environment.......................................................................... 172
9.1.3 Operation Navigator ............................................................................................ 173
9.1.4 Machine Coordinate System (MCS) ................................................................... 174
9.1.5 Geometry Definition............................................................................................ 174
9.2 CREATING OPERATION AND PARAMETER SETTING .................................... 176
9.2.1 Creating a new Operation .................................................................................... 176
9.2.3 Tool Creation and Selection ................................................................................ 177
9.2.4 Cut Method .......................................................................................................... 180
9.2.4 Step Over and Scallop Height: ............................................................................ 181
9.2.5 Depth per cut ....................................................................................................... 182
9.2.6 Cutting Parameters .............................................................................................. 183
9.2.7 Avoidance............................................................................................................ 185
9.2.8 Feedrates.............................................................................................................. 186
9.3 PROGRAM GENERATION AND VERIFICATION................................................ 188
9.3.1 Generating Program............................................................................................. 188
9.3.2 Tool Path Display ................................................................................................ 189
9.3.3 Tool Path Simulation ........................................................................................... 189
9.3.4 Gouge Check ....................................................................................................... 193
9.4 OPERATION METHODS .......................................................................................... 193
9.4.1 Roughing ............................................................................................................. 193
9.4.2 Semi-Finishing .................................................................................................... 194
9.4.3 Finishing Profile .................................................................................................. 197
9.4.4 Finishing Contour Surface................................................................................... 205
9.4.5 Flooring ............................................................................................................... 210
9.5 POST PROCESSING.................................................................................................. 213
9.5.1 Creating CLSF..................................................................................................... 214
9.5.2 Postprocessing ..................................................................................................... 216
CHAPTER 10- FINITE ELEMENT ANALYSIS...................................................... 218
10.1 INTRODUCTION TO FEA...................................................................................... 218
Unigraphics-NX3 for Engineering Design
University of Missouri - Rolla
10.1.1 Element shapes and nodes ................................................................................. 218
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10.1.2 Structure Module ............................................................................................... 220
10.1.3 Scenario Navigator ............................................................................................ 222
10.1 SCENARIO CREATION.......................................................................................... 222
10.2.1 Material Properties ............................................................................................ 224
10.2.2 Loads ................................................................................................................. 224
10.2.3 Boundary Conditions......................................................................................... 225
10.2.4 Meshing ............................................................................................................. 226
10.3 SOLVING AND RESULT SIMULATION.............................................................. 228
10.3.1 Solving the Scenario.......................................................................................... 228
10.3.2 FEA Result ........................................................................................................ 229
10.3.2 Simulation.......................................................................................................... 231
10.4 EXERCISE-ARBORPRESS L-BAR ........................................................................ 234
Unigraphics-NX3 for Engineering Design
University of Missouri - Rolla
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